/*
 * This file is part of the TREZOR project, https://trezor.io/
 *
 * Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.com>
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <string.h>

#include "layout2.h"
#include "oled.h"
#include "pinmatrix.h"
#include "rng.h"

static char pinmatrix_perm[10] = "XXXXXXXXX";

void pinmatrix_draw(const char* text)
{
    const BITMAP* bmp_digits[10] = {
        &bmp_digit0,
        &bmp_digit1,
        &bmp_digit2,
        &bmp_digit3,
        &bmp_digit4,
        &bmp_digit5,
        &bmp_digit6,
        &bmp_digit7,
        &bmp_digit8,
        &bmp_digit9,
    };
    layoutSwipe();
    const int w = bmp_digit0.width, h = bmp_digit0.height, pad = 2;
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++) {
            // use (2 - j) instead of j to achieve 789456123 layout
            int k = pinmatrix_perm[i + (2 - j) * 3] - '0';
            if (text) {
                oledDrawStringCenter(0, text, FONT_STANDARD);
            }
            oledDrawBitmap((OLED_WIDTH - 3 * w - 2 * pad) / 2 + i * (w + pad), OLED_HEIGHT - 3 * h - 2 * pad + j * (h + pad), bmp_digits[k]);
        }
    }
    oledRefresh();
}

void pinmatrix_start(const char* text)
{
    for (int i = 0; i < 9; i++) {
        pinmatrix_perm[i] = '1' + i;
    }
    pinmatrix_perm[9] = 0;
    random_permute(pinmatrix_perm, 9);
    pinmatrix_draw(text);
}

void translate_pin_code(const char* matrix, char* pin)
{
    int k, i = 0;
    while (pin && pin[i]) {
        k = pin[i] - '1';
        if (k >= 0 && k <= 8) {
            pin[i] = matrix[k];
        } else {
            pin[i] = 0;
            break;
        }
        i++;
    }
}

void pinmatrix_done(char* pin)
{
    translate_pin_code(pinmatrix_perm, pin);
    memset(pinmatrix_perm, 'X', sizeof(pinmatrix_perm) - 1);
}

#if DEBUG_LINK

const char* pinmatrix_get(void)
{
    return pinmatrix_perm;
}

#endif
